The essentials of histology : descriptive and practical, for the use of students.

  • Sharpey-Schäfer, E. A. (Edward Albert), Sir, 1850-1935.
Date:
1885
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Licence: Public Domain Mark

Credit: The essentials of histology : descriptive and practical, for the use of students. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    (fig. 54). Near the circumference, and under the perichondrium or fibrous covering of the cartilage, they are flattened and parallel to the surface, but in the deeper parts they have a more irregular or a radi- ated arrangement. They frequently contain fat. The cartilages of the larynx and windpipe and of the nose resemble on the whole the costal cartilages, but the study of them may be deferred until the organs where they occur are dealt with. Elastic or yellow fibro-cartilage occurs in only a few situations. These are, the cartilage of the external ear and that of the Eustachian tube, the epiglottis and cartilages of Santorini of the larynx, and in some animals, e.g. the ox, the upper third of the arytenoids. The matrix is everywhere pervaded with well-defined branching fibres, which unite with one another to form a close network (fig. 55). These Fig. 55.—Section of the elastic carti- lage ok the ear. (Highly magnified.) ■ Fig. 56.—Section of part of the car- tilage of the epiglottis. a, cartilage-cell in clear area; b. granular- looking matrix near the middle of the carti- lage, the granular appearance being due partly to the fine reticulum of elastic fibres, partly to the presence of granules of elastic substance in the matrix ; c, clearer matrix with longer fibres. fibres resist the action of acetic acid, and are stained deeply by magenta; they are evidently elastic fibres. In the ox they are very large, but smaller in man, especially in the cartilage of the epiglottis (fig. 56). They appear to be developed by the deposition of granules of elastin in the matrix, which at first he singly, but afterwards become joined to form the fibres. White fibro-cartilage is found wherever great strength combined with a certain amount of rigidity is required : thus we frequently find fibro-cartilage joining bones together, asm the case of the intervertebral disks and other symphyses. Fibro-cartilage is frequently employed to line grooves in which tendons run, and may also be found in the tendons themselves. It is also employed to deepen cup-shaped articular sur- faces ; and in the case of the interarticular cartilages, such as those of the knee and lower jaw, to allow greater freedom of movement whilst diminishing the liability to dislocation. Under the microscope